Typewriting machine



Aug. 24 1926.

A. G. F. KUROWSKI TYPEWRITING MACHINE Filed August 41? 1923 WMV L W, mW/.7m .VZW w n Lw.

Patented Aug. 24, 1926.

N 1,597,321 PATENT OFFICE. j

ALFRED G. E. xUEowsKI, or BROOKLYN, NEWYoRIn AssIGNoR ro UNDERwooD '.rYrEwETER COMPANY, 0E NEW yon-K, N.

Ygn vcomjoaaTIoN or DELAWARE.

@ TYPEWRITING MACHINE.

Application led August 17, 1923. Serial No. 657,870.`

This invention relates to cylindrical platens for typewriting machines, and its object i is to produce an improved "platen of a kind fastened in spaced which offers a surface to impressions, deadened so to the type striking the platensurface.`

The platen is formed of a series of annular disks or washers placed side by side" The disks may be between two end plates. bound together by tie-rods extending through the series, and the tie-rods maybe relation to the plates. The disks or washers may be assembled and secured together by the end plates and the tie-rods to form a cylindrical core and then turned down to the proper size to have a noiseless cylindrical cover pushed over the core.

The disks or washers may be formed of linoleum, Neolin, or other tough, light and flexible material to assist in deadening the noise and absorbing the vibration due to the impact. The cylindrical cover is constructed of an inner part made of soft rubber, or the like, for absorbing and deaden ing the impact and an outer cover of hard` rubber, or the like, forming the platen surface.

A modification of the platen structure within the scope of the invention may be formed that will be much lighter than that disclosed above by moulding the core of linoleum, or of like material, having embedded therein spaced aluminum tie-rods, as shown in Figure 3. The core may have a relatively large hollow center with a supporting rib extending inwardly, midway between the ends of the core, andthrough the center of which rib the platen-shaft passes for holding the latter against the tendency to vibrate. A metallic embedded re-enforc ing piece is contained within the rib to establish a brace for the rods and the rib.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure l is a front elevation with parts broken away to show the interior section of the novel platen.

Figure 2 is a sectional elevation of the platen on the line A-A of Figure l.

Figure 3 is a view similar to F igure l, but showing a modified form of core.

give clear-cut typeand in which the impact is as to lessen the noise incidental The annular disks or washers l may be arranged sideby side to form, in the aggregate, the innercylindrical core of the platen.` The disks or washers 1 may be made of linoleum, orany other material having similar physical properties, which has Athe necessaryresilience and isat the same time light," tough and workable. The disks or `washers l may be perforated at the center to allow the platen-axle7 to snugly pass therethrough, and also may be perforated at preferablythree equidistant points about the center, the perforations being placed in alignment with one another when the disks are assembled. Tie-rods 2 may extend through such openings in the disks or `washers l about `the center, so as to join themtogether in ai tight pack.`

The series of disks 1 forming the core may be provided with circular metallic end plates 5 to form abutments for the fiat heads of screws Il. The bodies of the screws 4l, passing through the end plates 5, are posi- `tioned so as to be threaded into the ends tend. The platen-axle l may be secured to the hubs in any suitable manner, as by means of set-screws 8 extending through the threaded openings in the hubs.

The disks, end plates and tie-rods may be assembled to form t-he core of the platen, and may be turned down on a lathe to the desired diameter to form a smooth surface, so that a cylindrical cover 11 can be pushed over it. The cylindrical cover l1 comprises an inner part 9 made yof a exible, resilient material, like soft rubber, and an outer shell 10 of firmer material, like hard rubber; the outer surface being ground to give the exact size and surface finish.

A modification `of the platen within the scope of the invention may be formed which will be much lighter in weight than that disclosed above by casting the core 12, .see Figure 3, of linoleum, yor similar material. The core may have molded therein three spaced aluminum rods 2 arranged to be fastened to the plates 5 by the screws 4, as set forth above. The core may also have a hollow center 141 and anwinvvardlyextending supporting rib 13, midway between the ends of the core. Y may be embedded in the rib to brace the y rods and the rib. The latter also supports the platen-shaft, Which passes through the center of the core, against the tendency to. vibrate.

Either completed platen when used. Wil]- give as clear typevvriting as does the ordinary platen, since it has exactly the same sort of a surface to .support the Work-piece While'taling the type-impressions. The inner part 9, Vbecause of itsy flexibility and resiliency, Will deaden the impacty blow,sol

' `as to lessen. the noise diie tothe type striki the axle, and, in addition, will in a large ing the platen surface. The inner core formed of the disks or Washers l or molded reenforced core* l2 will aid the inner partI 9 tov deaden the impact blow, since either resiliently interposes. the platen cover and A metal re-enforcing piece 15 c 1. A d platen comprising a substantially har-d cylindrical outer shell forming a suitable surface to give clearcut type-impressions, vand a. relatively resilient inner core todeadren the impact, toV absorb thevibra tion and tolessenthe noise incidentalto the type striking the platen surface, said core comprising a series ofdisks of'l'ino-y leum placed side by side tightly clamped together. l Y

2..- A revoluble platen for a typewriting machine including' an axle on which Vthe platen is mounted, including a substantially hard cylindrical outer shell khaving a surface on which to make clear-cut type-impressions, and a relatively resilient inner core `oflli-nolenni between said outer shell and the platen axle to deaden the impact, to absorb the vibration and to. lessen the noise incidental to the type striking the platen surface.

ALFRED e. r. KuRoWsKi. y 

